package com.WFinstitute.util;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;


/**
 * 图片裁剪工具类
 * */
public class ImageCutUtil {
    // 源图片路径名称如:c:\1.jpg
    private String srcpath;
    // 剪切图片存放路径名称.如:c:\2.jpg
    private String subpath;
    // 剪切点x坐标
    private int x;
    // 剪切点y坐标
    private int y;
    // 剪切点宽度
    private int width;
    // 剪切点高度
    private int height;


    public ImageCutUtil(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }

    public void cut() throws IOException {
        String fmtName = srcpath.substring(srcpath.lastIndexOf(".") + 1, srcpath.length());
        FileInputStream is = null;
        ImageInputStream iis = null;
        try {
            // 读取图片文件
            is = new FileInputStream(srcpath);
            /**
             * 返回包含所有当前已注册 ImageReader 的 Iterator，这些 ImageReader 声称能够解码指定格式。
             * 参数：formatName - 包含非正式格式名称 . （例如 "jpeg" 或 "gif"）等 。
             */
            Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(fmtName);
            ImageReader reader = it.next();
            // 获取图片流
            iis = ImageIO.createImageInputStream(is);
            /**
             * <p>
             * iis:读取源.true:只向前搜索
             * </p>
             * .将它标记为 ‘只向前搜索’。 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader
             * 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。
             */
            reader.setInput(iis, true);
            /**
             * <p>
             * 描述如何对流进行解码的类
             * <p>
             * .用于指定如何在输入时从 Java Image I/O 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件 将从其
             * ImageReader 实现的 getDefaultReadParam 方法中返回 ImageReadParam 的实例。
             */
            ImageReadParam param = reader.getDefaultReadParam();
            /**
             * 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域，通过 Rectangle 对象
             * 的左上顶点的坐标（x，y）、宽度和高度可以定义这个区域。
             */
            Rectangle rect = new Rectangle(x, y, width, height);
            param.getSourceBands();
            // 提供一个 BufferedImage，将其用作解码像素数据的目标。
            param.setSourceRegion(rect);
            /**
             * 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象，并将 它作为一个完整的
             * BufferedImage 返回。
             */
            BufferedImage bi = reader.read(0, param);
            // 保存新图片
            ImageIO.write(bi, fmtName, new File(subpath));
        } finally {
            if (is != null)
                is.close();
            if (iis != null)
                iis.close();
        }
    }
    
    //裁剪图片
    public static void load(String imgpath,InputStream in,String wh) throws IOException {
    	String fmtName = imgpath.substring(imgpath.lastIndexOf(".") + 1, imgpath.length());
    	ImageInputStream iis = null;
    	int width=0;
    	int height=0;
    	int x=0;
    	int y=0;
    	try {
    		Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(fmtName);
    		ImageReader reader = it.next();
    		// 获取图片流
    		iis = ImageIO.createImageInputStream(in);
    		reader.setInput(iis, true);
    		ImageReadParam param = reader.getDefaultReadParam();
    		if(wh!=null){
    			int w=reader.getWidth(0);
    			int h=reader.getHeight(0);
    			String[] _wh=wh.split(",");
    			int _cw=Integer.valueOf(_wh[0]);
    			int _ch=Integer.valueOf(_wh[1]);
   			if(w>h){
    				height=h;
    				width=h/_ch*_cw;
    				x=Math.abs(w-width)/2;
    				y=0;
    			}else{
    				width=w;
    				height=w/_cw*_ch;
    				y=Math.abs(h-height)/2;
    				x=0;
    			}
   			
   			    System.out.println(x+","+y+","+width+","+height);
   			//设置图片宽度
        		Rectangle rect = new Rectangle(x, y, width, height);
        		//Rectangle rect = new Rectangle(x, y, 108, 108);
        		param.setSourceRegion(rect);
    		}
    		BufferedImage bi = reader.read(0, param);
    		// 保存新图片
    		ImageIO.write(bi, fmtName, new File(imgpath));
    	}catch(Exception e){
    		e.printStackTrace();
    	} finally {
    		if (iis != null)
    			iis.close();
    	}
    }
    //按比例重新绘制图片
    public static void createrImg(String imgpath,InputStream in,String wh) throws IOException {
    	String fmtName = imgpath.substring(imgpath.lastIndexOf(".") + 1, imgpath.length());
    	ImageInputStream iis = null;
    	int width=0;
    	int height=0;
    	int x=0;
    	int y=0;
    	try {
    		Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(fmtName);
    		ImageReader reader = it.next();
    		// 获取图片流
    		BufferedImage buimg=ImageIO.read(in);
    		if(wh!=null){
    			int w=buimg.getWidth();
    			int h=buimg.getHeight();
    			String[] _wh=wh.split(",");
    			int _cw=Integer.valueOf(_wh[0]);
    			int _ch=Integer.valueOf(_wh[1]);
	   			if(w>h){
	    				width=w;
	    				height=w/_cw*_ch;
	    				y=Math.abs(height-h)/2;
	    				x=0;
	    			}else{
	    				height=h;
	    				width=h/_ch*_cw;
	    				x=Math.abs(width-w)/2;
	    				y=0;
	    			}
        		//BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        		BufferedImage tag = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
        		Graphics g=tag.getGraphics();
        		g.setColor(new Color(255,255,255));
        		//g.fillRect(0, 0, width,height);
        		g.fillRect(0, 0, 200,200);
        		g.drawImage(buimg, 0, 0, 200,200, null);
        		//g.drawImage(buimg, x, y, w, h, null);
	   			ImageIO.write(tag,fmtName, new File(imgpath));
    		}else{
    			ImageIO.write(buimg,fmtName, new File(imgpath));
    		}
    		// 保存新图片
    		
    	} finally {
    		if (iis != null)
    			iis.close();
    	}
    }
    public String getSrcpath() {
        return srcpath;
    }

    public void setSrcpath(String srcpath) {
        this.srcpath = srcpath;
    }

    public String getSubpath() {
        return subpath;
    }

    public void setSubpath(String subpath) {
        this.subpath = subpath;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }
    
    public static void main(String[] args) {
    	ImageInputStream iis = null;
		File file=new File("D:\\1469836152451.jpg");
		Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("bmp");
		ImageReader reader = it.next();
		// 获取图片流
		try {
			iis = ImageIO.createImageInputStream(file);
			reader.setInput(iis, true);
			ImageReadParam param = reader.getDefaultReadParam();
			BufferedImage bu=param.getDestination();
			System.out.println(bu.getHeight());
			//System.out.println(bu.getWidth());
			//System.out.println(param.getSourceMaxProgressivePass());

		} catch (IOException e) {
			e.printStackTrace();
		}
		

		
		
	}
    
}
